fastify.post('/', {
    schema: {
        consumes: ['multipart/form-data'],
        body: Type.Object({
            // file: {isFile: true} as unknown as TSchema
            file: Type.Unsafe<{ toBuffer: () => Promise<Buffer> }>({ isFile: true })
        }),
        response: {
            200: Type.Object({
                ok: Type.Boolean()
            })
        }
    },
    config: {
        multipart_options: {
            limits: {
                fileSize: 1024*1024*2 // 2MB
            }
        }
    }
}, async (req, rep) => {
    const buf = req.body.file.toBuffer();
    return { ok: true }
})